private void PlaceNewTile(ushort tileType, MapId mapId, Vector2 position)
{
// tile can snap up to 0.75m away from grid
var gridSearchBox = new Box2(-0.5f, -0.5f, 0.5f, 0.5f)
.Scale(1.5f)
.Translated(position);
var gridsInArea = _mapManager.FindGridsIntersecting(mapId, gridSearchBox);
IMapGrid closest = null;
float distance = float.PositiveInfinity;
Box2 intersect = new Box2();
foreach (var grid in gridsInArea)
{
// figure out closest intersect
var gridIntersect = gridSearchBox.Intersect(grid.WorldBounds);
var gridDist = (gridIntersect.Center - position).LengthSquared;
if (gridDist >= distance)
{
continue;
}
distance = gridDist;
closest = grid;
intersect = gridIntersect;
}
if (closest != null) // stick to existing grid
{
// round to nearest cardinal dir
var normal = new Angle(position - intersect.Center).GetCardinalDir().ToVec();
// round coords to center of tile
var tileIndices = closest.WorldToTile(intersect.Center);
var tileCenterWorld = closest.GridTileToWorldPos(tileIndices);
// move mouse one tile out along normal
var newTilePos = tileCenterWorld + normal * closest.TileSize;
// you can always remove a tile
if (Tile.Empty.TypeId != tileType)
{
var tileBounds = Box2.UnitCentered.Scale(closest.TileSize).Translated(newTilePos);
var collideCount = _mapManager.FindGridsIntersecting(mapId, tileBounds).Count();
// prevent placing a tile if it overlaps more than one grid
if (collideCount > 1)
{
return;
}
}
var pos = closest.WorldToTile(position);
closest.SetTile(pos, new Tile(tileType));
}
else // create a new grid
{
var newGrid = _mapManager.CreateGrid(mapId);
newGrid.WorldPosition = position + (newGrid.TileSize / 2f); // assume bottom left tile origin
var tilePos = newGrid.WorldToTile(position);
newGrid.SetTile(tilePos, new Tile(tileType));
}
}
